Poly(ethylene)-co-Poly(norborn-2-ene) Prepared by Group IV Bisamido and Half-Sandwich Amido Complexes with Pendant Aminoborane Groups: Vinyl Insertion vs Ring-Opening Metathesis Polymerization

Polyethylene-g-Polystyrene Copolymers by Combination of ROMP, Mn2(CO)10-Assisted TEMPO Substitution and NMRP

The synthesis of polyethylene-graft-polystyrene copolymers by a multistep "grafting from" approach is described. In the first step, a bromo-functional polyethylene (PE-Br) was synthesized via ring-opening metathesis polymerization (ROMP) of cis-cyclooctene (COE) and quantitative hydrobromination. Subsequent irradiation of PE-Br under visible light in the presence of dimanganese decacarbonyl (Mn₂(CO)₁₀) and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) resulted in the formation of TEMPO-substituted polyethylene (PE-TEMPO). Polystyrene (PS) chains were then grown via nitroxide mediated radical polymerization (NMRP) from the PE-TEMPO precursor to give desired PE-g-PS copolymers in a controlled manner. The intermediates at each step and final graft copolymers were characterized by ¹H NMR, FT-IR, GPC, and DSC analyses.

Tandem vinyl insertion-/ring-opening metathesis copolymerization with ansa-6-[2-(dimesitylboryl)-phenyl]pyrid-2-ylamido zirconium complexes: role of trialkylaluminum and MAO

Activation of Zr-bisalkyl complexes containing the η⁵-tetramethylcyclopentadienyl-6-[2-(dimesitylboryl)phenyl]pyrid-2-ylamido motif with MAO offers access to poly(ethylene)-co-poly(norbornene) with ROMP-derived sequences.

Group 4 metal complexes bearing the aminoborane motif: origin of tandem ring-opening metathesis/vinyl-insertion polymerization

The origin of tandem ring-opening metathesis/vinyl-insertion polymerization using tailored group 4 metal complexes is outlined.